Compilare: main.cpp: In function 'int main()': main.cpp:50:9: warning: unused variable 'i' [-Wunused-variable] int i; ^ main.cpp:44:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("taxa.in", "r", stdin); ^ main.cpp:45:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("taxa.out", "w", stdout); ^ main.cpp:47:56: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%hd%hd%hd%hd%hd%hd\n",&N,&M,&l0,&c0,&lf,&cf); ^ main.cpp:52:41: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets( buf, 2 * Nmax + 1, stdin); ^